U23 2007/MateCrew

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avr-portremote-server

Unser Hauptprojekt ist eine Komplette Implementierung eines Dienstes auf dem Etherrape und einem zugehörigen Client mit eigens entwickeltem Protokoll zur Steuerung der IO Pins über die Netzwerkschnittstelle. Hierzu fassen wir ein Passwort,ein Kommando,den IO Port und einen Wert,der gesetzt/weggenommen werden soll in unsere Protokollimplementierung.

Im folgenden die Implementierung des Clients: 


#include <iostream>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <math.h>

#define MAX_COMMANDS 4
#define MAX_PORTS 3
//#define DEBUG 	// setzen fuer debug ausgaben
#define MAX_ARGS 7

#define GET_MODE 2

using namespace std;

char * command_types[MAX_COMMANDS]={"additive","substractive","get","set"};
char * port_types[MAX_PORTS]={"DDRA","DDRC","DDRD"};


struct remote_command{
/*{{{*/	
	string password;
	unsigned int command_type;
	unsigned int ioport;
	unsigned int value;

/*}}}*/

} user_command;

void list_commands(){
/*{{{*/
	for(int i=0;i<MAX_COMMANDS;i++)

		cout<<"["<<i<<"]"<<"\t "<<command_types[i]<<endl;
/*}}}*/
}


void list_ports(){
/*{{{*/
	for(int i=0;i<MAX_PORTS;i++)

		cout<<"["<<i<<"]"<<"\t "<<port_types[i]<<endl;
/*}}}*/
}

void interactive(){
/**/
}

void make_request(string& request,char* pw=0,char* com=0,char* ioport=0,int dec_val=0){
/*{{{*/	
		request= ( (pw!=NULL) ? pw : user_command.password ) ;
		request+=" ";
		request+=( (pw!=NULL) ? ( (unsigned char)atoi(com) ) : ( (char)(user_command.command_type) ) );
		request+=( (pw!=NULL) ? ( (unsigned char)(atoi(ioport)) ):(char)(user_command.ioport));
		request+=( (pw!=NULL) ? ( (unsigned char)(unsigned int)dec_val) : (char)(int)(user_command.value));
	
		#ifndef DEBUG
		cout<<"hier gecastet auf void: "<<(int)&(user_command.value)<<endl;
		#endif

/*}}}*/
}

void write_output(char* buf){
/*{{{*/
	cout<<"Command: "<<command_types[(int)(unsigned char)(buf[0])] 
     	   		 <<endl<<"Port: "<<(int)(unsigned char)(buf[1])
     	   		 <<endl<<"Wert: "<<(int)(unsigned char)(buf[2]);

/*}}}*/
}

int main(int argc,char* argv[]){

	sockaddr_in target;
	int mysocket=socket(AF_INET,SOCK_STREAM,0);
       string request;
	char buf[64]; 

	if(argc < 3){
	
		cout<<"usage: "<<argv[0]<<" {target-ip} {target-port} [password command ioport value]"<<endl;
		exit(1);
	
	}
	
	if(argc < 4 ){
		
		interactive();
		make_request(request);
		
	}
	
	else{ 

		int dec_val=0;
	
		if(argc < MAX_ARGS){ 

			cout<<"Too few arguments for a command!!!"<<endl;
			exit(1); 

		}	
		
	        else{		
		
			#ifdef DEBUG
			cout<<"VALUE IST: "<<argv[6];
			#endif
		
			sscanf(argv[6],"%x",&dec_val);	
			make_request(request,argv[3],argv[4],argv[5],dec_val);
		
		}
	}
	
		
	#ifdef DEBUG
	/*{{{*/	
		cout<<"request is: "<<request<<endl;
		cout<<"length of request:  "<<request.length()<<endl;
		cout<<"values: "<<endl;
		
		for(unsigned int i=0;i<=request.length();i++){
		
			cout<<"position: "<<i<<" int wert: "<<(int)request[i]<<" zeichen: "<<request[i]<<endl;
		
		}
	/*}}}*/
	#endif	 

	target.sin_family=AF_INET;
	target.sin_port=htons(atoi(argv[2]));
	target.sin_addr.s_addr=inet_addr(argv[1]);
	 

	// establish connection
	if(connect(mysocket,(sockaddr*)&target,sizeof(target))<0)
		
		err<<"failed to establish connection"<<endl;
	
	
	cout<<"connection established"<<endl;
	 

	//send command to etherrape	
	if(write(mysocket,(void*)request.c_str(),request.length() + 1) < 0)
		
		cerr<<"failed to write data"<<endl;



 	
 	// etherrape will send us the port status 
 	if(user_command.command_type== GET_MODE ){
  	
  	  	if(read(mysocket,(void*)buf,strlen(buf)-1)>=1){
  			
 			write_output(buf);
 		
 		}
 
 		else{ 
 
 			cerr<<"failed to read data"<<endl;
 		
 		}
 	
 	} 

	close(mysocket);
	
	return 0;
}


portremoted: 

#include <string.h>

#include "../uip/uip.h"
#include "../debug.h"
#include "fnord.h"

struct fnord_command{
	/*
	 * stores all needed protocol data
	 */
	uint8_t ctype;  //command type (set,unset,additive,substractive)
	uint8_t ioport; //ioport  (PORTA/C/D)
	uint8_t data;   //data (1 byte)

} incoming_command;

void init_fnord(void){
       // we listen on port 2324 (defined in fnord.h)
	uip_listen(HTONS(FNORD_PORT));

}


void net_add_port(){
	/*
	 * add incoming value to PORTX
	 */
	cfg.options.io_ddr[(incoming_command.ioport)] |= incoming_command.data; 
	cfg.options.io[(incoming_command.ioport)] |= incoming_command.data; 

}

void net_sub_port(){
	/*
	 * substract incoming value from PORTX
	 */
	cfg.options.io[(incoming_command.ioport)] &= ~(incoming_command.data); 

}

void net_get_port(){
	 /*
	  * substract incoming value from PORTX
	  */
	((uint8_t *)uip_appdata)[0]=NET_GET_PORT;
	((uint8_t *)uip_appdata)[1]=incoming_command.ioport;
	((uint8_t *)uip_appdata)[2]=cfg.options.io[(incoming_command.ioport)];
	((uint8_t *)uip_appdata)[3]='\0';
	
	uip_send(uip_appdata,4);

}

void net_set_port(){
	cfg.options.io[(incoming_command.ioport)] = incoming_command.data;
}

void handle_fnord(void) {

	uint8_t logged_in=0;
	
	if(uip_connected())
		debug_print("New client connected\n");
		
	if(uip_newdata()) {
		((uint8_t *)uip_appdata)[uip_datalen()] = 0;
		
		
		uint8_t offset=0;
		char password[uip_len];
		
		for(offset;((uint8_t *)uip_appdata)[offset]!=' ' && offset<uip_len;offset++){
				password[offset]=((uint8_t *)uip_appdata)[offset];	
		}
		
		password[offset]='\0';
		
		debug_printf("Password is: '%s', user entered: '%s' \n",FNORD_PASS,password);
		
		if(!(strcmp(password,FNORD_PASS)))
			logged_in=1;
		else
			logged_in=0;
			
		if(logged_in){
			debug_print("Password correct, logged in!\n\n");
			
			incoming_command.ctype=((uint8_t *)uip_appdata)[++offset];
			incoming_command.ioport=((uint8_t *)uip_appdata)[++offset];
			incoming_command.data=((uint8_t *)uip_appdata)[++offset];
			
			debug_print("New data recieved:\n");
			debug_printf("ctype: %i\n",incoming_command.ctype);
			debug_printf("ioport: %i\n",incoming_command.ioport);
			debug_printf("data: %i\n\n\n",incoming_command.data);
			
			switch(incoming_command.ctype){
				case NET_ADD_PORT: net_add_port();
					  break;
				case NET_SUB_PORT: net_sub_port();
					  break;
				case NET_GET_PORT: net_get_port(); 	
					  break;
				case NET_SET_PORT: net_set_port();
					  break;
			}
		}
		else
			debug_print("Incorrect password!\n\n\n");
	}

}

LED-Dimmer

Für unseren Dimmer für LEDs benutzen wir insgesamt 3 Funktionen:

  • Die Main mit einer Endlosschleife für ewiges hell und dunkel Dimmen durch Aufruf von den andern Beiden Funktionen
  • Die Funktion my_wait(uint32_t time), welche einfach wartet
  • Die Funktion dim(uint8_t ratio), welche für den schnellen Ein-/Ausschaltvorgang der LEDs zuständig ist

Die Main: 

 #include <avr/io.h>
 #include <util/delay.h>

 #define F_CPU 2000000000L

 void my_wait(uint32_t);
 void dim(uint8_t); 
 int main(){	
   DDRA=0xff;
 
   // LED ausschalten
   PORTA=0;
   uint16_t i=0;    
   PORTA|=0x02;
 
   //Die Endlosschleife
   for(;;){
     for(i=0;i<0xfff;i++){
 
       // ein bisschen warten
       my_wait(1);
 
       // ein- und ausschalten
       // je größer i wird desto größer wird auch der Quotient der an bla übergeben wird
       // dadurch verändert sich auch der zeitliche Abstand zwischen dem Ein- und Ausschalten
       // wodurch die LED wiederum heller oder dunkler erscheint
       dim(i/0xf);		
     }
   }
   PORTA|=0x03;	
   return 0;
 }

Die Wait: 

 void my_wait(uint32_t time)
 {	
   uint32_t i=0;
   for(i;i<(time);i++)
 
   //vordefinierte Funktion welche einen Leerlauf in Dauer von n Milisekunden auslöst
   _delay_ms(1);
 }

Die Dim: 

 void dim(uint8_t ratio){
   uint32_t i=0;	
 
   // LED anschalten
   PORTA|=0x01;
   for(i;i<ratio;i++){}
 
   // LED ausschalten
   PORTA&=~0x01;
   for(i=ratio;i<255;i++){}
 }

Project

Team

  • Scout
  • F3lix
  • Toby
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